... well, tonight i finally bit the bullet, and did something I wanted to do since i bought my car.... top her out...

For some reason I thought the speed limiter was at 130... so needless to say when I was driving, put the car in diagnostic mode and went to digital speedo... and accelerated, which it was doing a great job at... I was surprised when the limiter came in at 110... it would go to 109, then feel like the fuel was cut, down to 107, then back up again.... I was surprised.. the 4.9 was pulling very nice at 100+ since the only other times (twice) I hit 100 before were on long back roads, kinda curvy and uphill... the 4.9 has a nie topend for what it is...

I guess I will have to get that Fast Chip now to remove the limiter... I am tempted to see what she'll do (next year though) I didn't check the RPM though...

... although that isn't the real speed of the car, I was going faster... my speedo is inaccurante to begin with, and I also have a bigger wheel *and* taller tire then stock on, which effectivly raises the gearing.. dare I say the car was really ding 120+?

when the dash analog speedo says I am doing 80, and I go into diagnostic mode, it says I am doing 93... When the dash speedo said I was doing 75, I checked engine RPM and it was 2500.... so I want to see what that comes out to be in MPH....

... the only part i didn't like.. is the fact i only have 4 lugnuts on my front left wheel... been like that for a couple months now... 1 stud stripped, and havn't had a chance to change it... I also need to be careful about taking turns faster then normal, as I have done int he past.. I am sure it is putting stress on my new wheel, and the surrounding lugs....

I must say though, at 110+ my 12 year old car was quiet (well, wind noise) road smooth and no vibaration... in fact for a while I was crusing arounf 95, and was very surprised at how docile the car was... it likes the higher speeds... and is a great crusier....

... this was on the NYS Thruway... 2 lanes, wide open, very long stright aways... not like I was doing anything stupid on a mountian road or something...

I know how to get into diagnostic mode but how do you get it to give you your RPMs and speed? I have the main speedometer that only goes to 85(analog). Thats pretty cool, I must say I have yet to go that fast :rolleyes2. I have seen your wheels they are 16's right, does it all fit well in the wheel well?

yes, the 16" wheel with the 225/60/16 tire fits perfectly fine... no rubbing, scraping or anything at all... ride is a litl ebetter too... and I actually have decent tires on it now, the old tires were crap...

The best i could say is, pick up a factory service manual.... it goes over everything... the OBD on these cars are so extensive, it is amazing.

When you gointo diagnotisc mode, press Lo on the ECC, it'll say something like P.2.5... keep pressing Lo, when it gets to P.0.9, that is vechicle speed... taken right from the speed sensors, meaning I woudl trust that more then the dash speed... it's range is 0-255mph. Pres Lo one more time, to P.0.8, and that is enigne RPM.... it is a 2-3 digit number... so 65 would be 650rpm... what my engine idles at... if it is 156, that is 1,560rpm etc... just have to add a 0 on the end.

On the '92 STS with the 4.9.. the tach redlines at 5250... every time i do a WOT run, she'll shift into 2nd at 4900rpm... only once did I manage to get it at 5,050... gotta love the low end torque though...

sweetness, yeah I'll have to purchase a manual.

I have read in the manual that the speed limiter is 127 somewhere. I'll check the page if I can find it.

Interesting. GM likes to change the limiter on different cars based on the tire speed rating. What did yours come with factory?

Basically a Touring Sedan might be the 127 and the reg Sedan/Fleetwood might be 110.

On the 110 then slow to 107. There is a fuel cutoff, and a fuel restore. So you can theoretically do a custom chip and do fuel cutoff at 35 mph and restore at 25 (just to tick off the oil change shop kids when you bring it in!!)

Scott Mueller did that on his 1989 Turbo T/A. Cutoff at 36 mph, restore at 35. There is also Ignition Cutoff on the distributorless cars.

As for mine, my wife got it up to 103 getting away from traffic one day. I have only had mine up to 90 or so. She was amazed how fast it got there....

Tom

well, FastChips.com sells the chip for $160....they say it adds 20hp and 30ft-lbs of torque or something like that... yeah right, in the least case, it may add something, but it also removes the speed limiter...

my car is not a Touring Sedan (it is a Coupe) and dosn't have anything special for high-speed... I forgot what my tires are (differnt wheel and tire size then factory) for speed rating, I think like 112 or 120 or something... eh, either way a quick blast to 130 or what ever she'll do won't hurt anything...

... I have a new-found love for the top end of a 4.9... I am just surprised how much it was pulling up to that point... I want to do it again, but note the RPM, because I know I was going faster then that, becuase I have a bigger wheel, and higher sidewall tire... maybe I was doing 120ish....

today on my way to PA (well, I was in PA at the time) it was wide open, very long roads... I put the car in diagnostic mode... then floored it... it was up a slight hill, I was crusing about 88 or so, pulled to 106 really nice, then as I got to the main part of the hill, she stayed at 106...with my foot to the floor... then came back up, then the road leveled off, I switched to tach, and when the car hit the speed limiter (110) she was turning over 4,200rpm in 3rd...

... something I also noticed... I was going about 75 and floored it, only downshifted into 3rd... and i noticed the tach said 3,000rpm... i though that was strange... so at 80mph, I manually downshifted into 2nd, and I was surprised to see the RPM only go to 4,700.... under WOT it'll shift into 3rd around 75... maybe 78 or so... but it is shifitng before redline, when I had it in second, I kept my foot to the floor and ran it to 4,900rpm or so, ad it pulled far better then 3rd... then I bumped it up to drive again...

I bookmarked a site where you can tyep all the info in and it'll tell you your speed, I really think I was doing more then 110...

since i replaced the stud for the wheel, and have 5 lugs on the left front wheel again, there is no more vibration at all... very smooth... this car crusies at 100 just as nice as 60.... honestly going there (I was by myself) I was doing about 85-90 the whole way.... no ops there, PA has nice roads and I have my radar detector... I am truely impressed witht he 4.9 though.... it just gives me bad ideas of the 300hp NorthStar Eldo ETC..... those top out over 150mph+, right? :devil:

Cought you!! This is why your gas mileage is low. :bouncy:

lol...

no.... that was going...

... I would keep resetting the millage on the FDC... coming back I had a steady 75 set and it was only 20...

please, when I was having some fun it went down to 15.... according to the FDC (so it is really less)

Something interesting...

I know I had to be doing more then 110mph... when I set the cruise around 75 or so, I am passing everyone up... I must really doing 80 or so... although I apssed one of those signs that say you speed, my speedo said 58 and the sign said 61... I dunno

I have 16" wheels on the car and 225/60/16 tires... I did a rough measurement and it came out to be 26" tire diameter...

4,200rpm, FDR = 2.73, 3rd = 1.00, tire diamter = 26"

According to the site, it is 119mph... which I hoenslty belive to be more closer to the real world figure... I don't belive the 4.9 would not acclerater around 100 up that hill, it had to have been faster....

... keep in mind too, the car came with 15" wheels, so my wheel is 1" wider, and the tires that it came with were 205/70/15... so I have a wider and taller tire... it effictivly raises my gearing... also, if this was almost 120, it was pulling pretty nice too....

3rd in the 4T60E is 1.00, right?

Heh, this mph calculator is fun... I measured the diamter on all my cars...

Olds has a 14" wheel and 195/65/14 (IIRC)

'79 has a 15" wheel and 235/75/15...

... if the 425 was turning over at 3,200rpm, in top gear... 1.00, and the rear end is 2.28... a rough measure is 28 inches tire diamter... the car woudl be doing 117mph, if I was to get the enigne to redline in 3rd (aobut 4,200rpm) it would be psuhing 154mph...

I think I read some where a stock '79 will top out around 110... I know in the owners manual, it says exported cars were shipped with H (?) rated tires that were rated at 118mph "which exceeds vehcile speed capability"

but it the top speed was only 110, then the 425 would only be spinning at 3,000rpm and read top speed?..... damnit.. I am gonna have to buy a GPS now...

Heh, this mph calculator is fun... I measured the diamter on all my cars...

Olds has a 14" wheel and 195/65/14 (IIRC)

'79 has a 15" wheel and 235/75/15...

... if the 425 was turning over at 3,200rpm, in top gear... 1.00, and the rear end is 2.28... a rough measure is 28 inches tire diamter... the car woudl be doing 117mph, if I was to get the enigne to redline in 3rd (aobut 4,200rpm) it would be psuhing 154mph...

I think I read some where a stock '79 will top out around 110... I know in the owners manual, it says exported cars were shipped with H (?) rated tires that were rated at 118mph "which exceeds vehcile speed capability"

but it the top speed was only 110, then the 425 would only be spinning at 3,000rpm and read top speed?..... damnit.. I am gonna have to buy a GPS now...

i'm surprized that your deville only topped out at 110, when i was going up to the dragstrip this summer i raced a GTI Golf and i have the digital dash and when i floored it i was doing about 4,600 RPM going by the tach that i installed from the distrubutor and the dash was going 110....111....then 112 mph but it would blink for about a good 15 seconds once i hit the 112, and then the speed limiter cut the fuel and back down to 108 it when,and very violently might i add.so i figure with the blinking 112 mph i think i hit about 115 or maybe 120 mph,but highly unlikely 120.

well, my car isn't a touring version or anything.. origanally came with steel wheels and hub caps... it wasn't ready for top end speed...

but with the bigger wheel and taller tires... I truely believe the real life speed of the car was around 120mph... before it was limited...

I want to get the Garmen Gecko... it is $100, then next year when I buy the chip to remove the limiter... I want to see what the car really can do... and compare it to the reading I get form the dash...

BTW the speedo was pegge at 85, I had the ca rindiagnostic mode... I was switching between tach and speedo, and when the speedo said 110 (well cutoff was 109, it would drop to 107, then go back to 109 etc...) the tach was around 4,175rpm, but it peaked at 4,200, thent he car slowed up again...

well, FastChips.com sells the chip for $160....they say it adds 20hp and 30ft-lbs of torque or something like that... yeah right, in the least case, it may add something, but it also removes the speed limiter...

my car is not a Touring Sedan (it is a Coupe) and dosn't have anything special for high-speed... I forgot what my tires are (differnt wheel and tire size then factory) for speed rating, I think like 112 or 120 or something... eh, either way a quick blast to 130 or what ever she'll do won't hurt anything...

... I have a new-found love for the top end of a 4.9... I am just surprised how much it was pulling up to that point... I want to do it again, but note the RPM, because I know I was going faster then that, becuase I have a bigger wheel, and higher sidewall tire... maybe I was doing 120ish....

The diameter of your tires are the same as a 15 inch rim. You have a smaller sidewall that takes up the extra space of the 16 inch wheels. Your diamter of your tire was probably around 26.5 or whatever with the 15's. With the 16's it's still around 26.5, give or take one or two millimeters. Check tirerack.com if you don't believe me.

Can you post a pic of your rims? I'd like to see them.

Later,
Dave

I got this off of www.tirerack.com.

Here are the specs of the same tire, Michelin XW4.


P205 70R15. Diameter 26.4" RPMs per mile = 789.

P225 60R16. Diameter 26.7" RPMs per mile = 782.


As you can see the difference is so minimal you probably wouldn't even see a difference in your MPH.

Also, if you check a P205 70R15 in different tires, same make or not, they all have slightly different specs. A P205 70R15 in the Michelin Symmetry has a diameter of 26.1". Same size, same make, different diameter.


Later,
Dave

So my 225/60/16 have a diamter of 26.7"?

that measn I was going even faster, because my quick guess (going outside with ruler and doing a cheap measuring job) got 26"...

So instead of 120, it was 122mph.... and that was only becuase it was electronically limited... damn, I am treuly impressed with the 4.9.... and the whole car...

I thought I got a taller sidewall with my new tires? they look taller....

so I actually have a smaller sidewall with the 16" wheels?

Here are 2 pics... the first is with the 15" steelies and hub caps... and nice white walls the car came with, the other is the new 16" '98- mid '01 Seville SLS wheels...

oh, I understand what you are saying with my speed, how the new wheels/tires shouldn't make a difference...

.. if I drive so the analog dash speedo says 75, but I go into diagnostic mode, the digital read out of my speed is around 81 or so... that is right from the speed sensors...

when I was doing about 58, those things that tell you your speed said 61... but I was only passing it for a few seconds...

.. when the dash speedo says 85, the digital one in diagnostics will say 95 or so...

so for now, I don't know how much my speedo is off... I'll either have to get a GPS, or have someone clock me with a radar gun or something...

Those rims look really nice. Surprised to see how much I like them without white walls.

I'm not sure if your exact tire has a diameter of 26.7". Are you using the Michelin XW4 that I had mentioned? If it's not that tire than the diameter is probably a little different. What tires do you have? Go on www.tirerack and you can get all that info yourself!


Later,
Dave

I also just recently got new rims for my Eldorado. I got chrome Deville Rims from a 94. They're still 15's so the tire remained the same. I was thinking of getting the SLS rims in chrome that you got or the 16 inch Deville rims that were on the 96-99. There weren't any tires I found with a white wall and good traction, I'm not a fan of michelins, they hook up like crap and have a flimsy sidewall. They're good for old grandpa cruising but if you ever need to make an emergency manuever they don't hook. Anyways, I didn't think it would look right without a white wall. I found those 15's on ebay for $400 shipped, shipping was $150 so it was a pretty good deal. After seeing your rims I think I should have gone with the 16's and no whitewall!

Oh well! I guess I can always buy some new rims again.

Check out my pics and let me know what you think.

Later,
Dave

99zee...look on my webpage, i have the exact same set of rims for my 91' seville. i paid 100 for the whole set, tires and all from someone i know here in town. nice looking on the eldo BTW.

99zee...look on my webpage, i have the exact same set of rims for my 91' seville. i paid 100 for the whole set, tires and all from someone i know here in town. nice looking on the eldo BTW.


$100! Damn, I thought I got a deal!!!


Looks good man!!!

Later,
Dave

just in case anybody cares, i cruised 105-112 (fuel cutoff at 112 for me) for about 30 miles. My car later thanked me for it. I bet I burned a whole quart of oil doing that! haha my car is such a piece of shit!

That is a deal... BTW, where did you find an OEM replacement grille? I noticed you ditched the E&G piece. Oh, and those with digital dashes.. theres a minor discreapancy with those displays too, as with the analog speedos. (makes sense, driven off the same PCM based signal. NOT directly from the VSS) 90 deville guy.. yours started blinking at 112? Im trying to keep track of which dashes are limited at 85 and which are not. Earlier cars started blinking right at 85 and wouldnt climb on the display DESPITE an increase in speed, verified through PCM readouts. Reason for my interest is I do swaps from the analog to digital dashes, and have tried to stay away from the earlier model clusters.

PROBLEM!!!!!!!!!!

I tried the diagnostic Tach, just for hahas, now my question is, does this in anyway interfere with tranny operation??? I ran around for a quick 5 min to check out the diagnostic tach, and after the first time i stopped, i was takin off in 2nd!!!!!! but i got her home, turned off the car, and opened the door,(so that the radio would kick off) and started her back up , and it was back to 1st gear... i was scared shitless at first, my sevilles 4T60-E went when it stared to start off in 2nd! then i drove around for a while regularly, and again it was started off in 2nd, i turned it off again, opened the door, and started it, and i was good, after i cleared the codes i was fine.

I had
98- Transaxle shift fault
and 91(had this for a while)- PNP switch or circuit fault

That is a deal... BTW, where did you find an OEM replacement grille? I noticed you ditched the E&G piece. Oh, and those with digital dashes.. theres a minor discreapancy with those displays too, as with the analog speedos. (makes sense, driven off the same PCM based signal. NOT directly from the VSS) 90 deville guy.. yours started blinking at 112? Im trying to keep track of which dashes are limited at 85 and which are not. Earlier cars started blinking right at 85 and wouldnt climb on the display DESPITE an increase in speed, verified through PCM readouts. Reason for my interest is I do swaps from the analog to digital dashes, and have tried to stay away from the earlier model clusters.


I got it the OEM grill from a junkyard! You can get new ones at http://www.cadillac-parts-dealer.com. I'm sure there are many other places you can get some too!

Later,
Dave

Hey guys how do I get the digital dash? I know how to go in Diagnostic mode.

99Zee, those wheels are nice... I like the chrome...

... my wheels are brushed aluminam, but before i bought them, they were highly polished and then clear coated... they are brand new too... I got them for $338 shipped :)

I have Good Year tires on now... on the back are my fathers old tires form his '99 GTP, still good tread though (Don't remember the version) on the fornt are brand new Allegras....

... I must say, despite all the bad things I heard about GR, these are amazing tires, grip like crazy, excellent in the rain, hardly ever spin etc... I am very very happy....

I didn't think I could get WW with a 16" tire, I later saw a newer DeVille and a Town Car, both had 16" wheels and the pencil WW.... looked nice...

I am very happy with my new wheel and tire purchess.... now that I have all 5 lug nuts back on the front left wheel, most all of the vibration around 60mph is gone... tires need to be balanced again probably (rear tires were never balcned though).... it is fine for now...

Does anybody have a superchips or a fastchips programmed chip for there 91-92 seville/eldorado or deville with the 4.9L v8? i emailed both companies about availability, and they no longer offer them, PLUS, they wantd $200 for theirs, when they had them in stock. If ANYone out there has a performance chip and would be willing to work with me, i can duplicate them cheaply for about $50 for anyone who wants one for their car, i would just need to get ahold of an actual chip so i could copy it for use with my programmer. whomever provides me with the chip, i would make them a duplicate chip for free so that they would have a backup incase they ever had computer damage. please email me at :



stickpony@gmail.com



thanks for your time,

Aaron

Aaronrus, the only thing that most chips do is advance the timing and remove the speed limiter. You can advance the timing for free. Of course you have to run premium gas.

Must be a damn teenager speeding like that.

Ed

The top end of the 4.9 is ok for what it was made for but a true story about mine is that im on a two lane road trying to pass the cars up ahead which I did ok, now I have this 07 Escalade (The one with 400 + horses and 418 lb-ft of torque) on my ass and my foot is through the floor trying to lose him.
After we both pass all the cars this guy gets into the next lane so effortlessely and passes me like I was doing 25 mph, boy did I feel slow that day. But then I thought my car is a less powerful 15 year old car against this new model year monster. The 4.9 does have good STREET manners though.

I drove my sixty special for around 200kms (120miles) at 175km/h (that's where my speed limiter came in, but i've had the car up to 180km/h (? speed limiter doesn't always work?). with a full trunk and 3 passangers. Car drove beutifully all the way but it took me 1 tank of gas. (lots of uphills)

I'm wondering why i've managed to get it to 180, and during the last trip i took the speed limiter kicked in at 175?